joannae - 博客园

32. Longest Valid Parentheses (JAVA)

摘要： Given a string containing just the characters '(' and ')', find the length of the longest valid (well-formed) parentheses substring. Example 1: Exampl 阅读全文

posted @ 2019-05-05 10:57 joannae 阅读(130) 评论(0) 推荐(0) 编辑

31. Next Permutation (JAVA)

摘要： Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possib 阅读全文

posted @ 2019-04-30 20:40 joannae 阅读(180) 评论(0) 推荐(0) 编辑

30. Substring with Concatenation of All Words (JAVA)

摘要： You are given a string, s, and a list of words, words, that are all of the same length. Find all starting indices of substring(s) in s that is a conca 阅读全文

posted @ 2019-04-30 17:38 joannae 阅读(108) 评论(0) 推荐(0) 编辑

29. Divide Two Integers (JAVA)

摘要： Given two integers dividend and divisor, divide two integers without using multiplication, division and mod operator. Return the quotient after dividi 阅读全文

posted @ 2019-04-28 11:31 joannae 阅读(215) 评论(0) 推荐(0) 编辑

23. Merge k Sorted Lists (JAVA)

摘要： Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity. Example: Input: [ 1->4->5, 1->3->4, 2->6 ] Output: 阅读全文

posted @ 2019-04-27 11:28 joannae 阅读(110) 评论(0) 推荐(0) 编辑

25. Reverse Nodes in k-Group (JAVA)

摘要： Given a linked list, reverse the nodes of a linked list k at a time and return its modified list. k is a positive integer and is less than or equal to 阅读全文

posted @ 2019-04-26 18:29 joannae 阅读(110) 评论(0) 推荐(0) 编辑

20. Valid Parentheses (JAVA)

摘要： Given a string containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. An input string is valid if: No 阅读全文

posted @ 2019-04-26 17:01 joannae 阅读(144) 评论(0) 推荐(0) 编辑

19. Remove Nth Node From End of List (JAVA)

摘要： Given a linked list, remove the n-th node from the end of list and return its head. Example: Given linked list: 1->2->3->4->5, and n = 2. After removi 阅读全文

posted @ 2019-04-26 16:36 joannae 阅读(96) 评论(0) 推荐(0) 编辑

18. 4Sum (JAVA)

摘要： Given an array nums of n integers and an integer target, are there elements a, b, c, and d in nums such that a + b + c+ d = target? Find all unique qu 阅读全文

posted @ 2019-04-26 16:07 joannae 阅读(184) 评论(0) 推荐(0) 编辑

16. 3Sum Closest (JAVA)

摘要： Given an array nums of n integers and an integer target, find three integers in nums such that the sum is closest to target. Return the sum of the thr 阅读全文

posted @ 2019-04-25 22:51 joannae 阅读(107) 评论(0) 推荐(0) 编辑